Information processing apparatus, information processing method, and storage medium

Abstract

The number of gradation levels to be obtained after lossy-compressed data corresponding to a predetermined number of gradation levels is expanded and gradation conversion is performed is determined in such a manner that the number of gradation levels is determined to be a first number of gradation levels in a case where the degree of compression when the data to be processed is compressed in lossy compression is more than a first threshold value, and the number of gradation levels is determined to be a second number of gradation levels in a case where the degree of compression is less than or equal to the first threshold value, the first number of gradation levels being smaller than the second number of gradation levels.

What is claimed is: 
     
       1. An information processing apparatus comprising:
 a memory configured to store a program; and 
 a processor configured to execute the program stored in the memory, 
 wherein the processor is to acquire information corresponding to a degree of compression of lossy-compressed data to be processed corresponding to a predetermined number of gradation levels; and 
 determine, based on the acquired information, a number of gradation levels to be obtained after the lossy-compressed data corresponding to the predetermined number of gradation levels is expanded and gradation conversion is performed so that the predetermined number of gradation levels of the expanded data is reduced, and 
 wherein the processor determines a first number of gradation levels as the number of gradation levels in a case where the degree of compression of the data to be processed is more than a first threshold value, and determines a second number of gradation levels as the number of gradation levels in a case where the degree of compression of the data to be processed is less than or equal to the first threshold value, the first number of gradation levels being smaller than the second number of gradation levels. 
 
     
     
       2. The information processing apparatus according to  claim 1 , wherein the processor determines a third number of gradation levels of the number of gradation levels in a case where the degree of compression is more than a second threshold value greater than the first threshold value, the third number of gradation levels being greater than the first number of gradation levels. 
     
     
       3. The information processing apparatus according to  claim 1 , wherein the processor is further configured to perform gradation conversion on the lossy-compressed data. 
     
     
       4. The information processing apparatus according to  claim 3 , wherein the processor configured to output data on which the gradation conversion has been performed by the gradation conversion unit to a predetermined apparatus that performs predetermined processing on the data. 
     
     
       5. The information processing apparatus according to  claim 4 , wherein the lossy-compressed data includes image data, and the predetermined apparatus performs, as the predetermined processing, printing or display of an image based on image data output by the processor. 
     
     
       6. The information processing apparatus according to  claim 5 , wherein the processor determines the number of gradation levels to be obtained when gradation conversion is performed in half tone processing in an error diffusion method for the image data for printing by the predetermined apparatus. 
     
     
       7. The information processing apparatus according to  claim 5 , wherein the processor determines the number of gradation levels in accordance with the degree of compression and a printing setting for printing of the image by the predetermined apparatus. 
     
     
       8. The information processing apparatus according to  claim 5 , wherein the processor determines the number of gradation levels in accordance with the degree of compression and contents of the image based on the image data. 
     
     
       9. The information processing apparatus according to  claim 8 , wherein the processor determines the number of gradation levels in accordance with a result of a determination as to whether a character is contained in the image as the contents of the image. 
     
     
       10. The information processing apparatus according to  claim 5 , further comprising a printing unit configured to print the image based on the image data output by the processor. 
     
     
       11. The information processing apparatus according to  claim 1 , wherein the lossy-compressed data to be processed is audio data. 
     
     
       12. The information processing apparatus according to  claim 1 , wherein the lossy-compressed data to be processed is image data which has been compressed in a Joint Photographic Expert Group format. 
     
     
       13. The information processing apparatus according to  claim 1 , wherein the process is further configured to perform expansion processing for the lossy-compressed data, wherein the processor determines the number of gradation levels when gradation conversion of expanded data which is obtained by expanding of the lossy-compressed data is performed. 
     
     
       14. The information processing apparatus according to  claim 13 , wherein the processor acquires, as information corresponding to the degree of compression, information used when the lossy-compressed data was lossy-compressed, and wherein the processor performs the expansion processing based on the acquired information, and the processor determines the number of gradation levels based on the information. 
     
     
       15. The information processing apparatus according to  claim 14 , wherein the processor acquires, as information corresponding to the degree of compression, information used for quantization processing when the lossy-compressed data was lossy-compressed. 
     
     
       16. The information processing apparatus according to  claim 15 , wherein the degree of compression is a Quantization factor corresponding to the quantization processing when the lossy-compressed data was lossy-compressed. 
     
     
       17. An information processing method performed by a processor by executing a program stored in a memory, the method comprising comprising:
 an acquisition step of acquiring information corresponding to a degree of compression of lossy-compressed data to be processed corresponding to a predetermined number of gradation levels; and 
 a determination step of determining, based on information acquired in the acquisition step, a number of gradation levels to be obtained after the lossy-compressed data is expanded and gradation conversion is performed so that the predetermined number of gradation levels of the expanded data is reduced, 
 wherein in the determination step, a first number of gradation levels is determined as the number of gradation levels in a case where the degree of compression of the data to be processed is more than a first threshold value, and a second number of gradation levels is determined as the number of gradation levels in a case where the degree of compression of the data to be processed is less than or equal to the first threshold value, the first number of gradation levels being smaller than the second number of gradation levels. 
 
     
     
       18. A storage medium storing a program for causing a computer to perform the information processing method according to  claim 17 .